Buggy code:
public class MongoSourceElement extends ConfigTestElement implements TestBean , TestStateListener { private static final long serialVersionUID = 2100L ; private static final Logger log = LoggingManager . getLoggerForClass ( ) ; private String connection ; private String source ; private boolean autoConnectRetry ; private int connectionsPerHost ; private int connectTimeout ; private long maxAutoConnectRetryTime ; private int maxWaitTime ; private int socketTimeout ; private boolean socketKeepAlive ; private int threadsAllowedToBlockForConnectionMultiplier ; private boolean fsync ; private boolean safe ; private boolean waitForJournaling ; private int writeOperationNumberOfServers ; private int writeOperationTimeout ; private boolean continueOnInsertError ; public String getTitle ( ) { } public String getConnection ( ) { } public void setConnection ( String connection ) { } public String getSource ( ) { } public void setSource ( String source ) { } public static MongoDB getMongoDB ( String source ) { Object mongoSource = JMeterContextService . getContext ( ) . getVariables ( ) . getObject ( source ) ; if ( mongoSource == null ) { throw new IllegalStateException ( "mongoSource<seq2seq4repair_space>is<seq2seq4repair_space>null" ) ; } else { if ( mongoSource instanceof MongoDB ) { return ( ( MongoDB ) ( mongoSource ) ) ; } else { <START_BUG> throw new IllegalStateException ( ( ( ( "Variable:" + source ) + "<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>a<seq2seq4repair_space>MongoDB<seq2seq4repair_space>instance,<seq2seq4repair_space>class:" ) + ( mongoSource != null ? mongoSource . getClass ( ) : "null" ) ) ) ; <END_BUG> } } } @ Override public void addConfigElement ( ConfigElement configElement ) { } @ Override public boolean expectsModification ( ) { } @ Override public void testStarted ( ) { } @ Override public void testStarted ( String s ) { } @ Override public void testEnded ( ) { } @ Override public void testEnded ( String s ) { } public boolean getAutoConnectRetry ( ) { } public void setAutoConnectRetry ( boolean autoConnectRetry ) { } public int getConnectionsPerHost ( ) { } public void setConnectionsPerHost ( int connectionsPerHost ) { } public int getConnectTimeout ( ) { } public void setConnectTimeout ( int connectTimeout ) { } public long getMaxAutoConnectRetryTime ( ) { } public void setMaxAutoConnectRetryTime ( long maxAutoConnectRetryTime ) { } public int getMaxWaitTime ( ) { } public void setMaxWaitTime ( int maxWaitTime ) { } public int getSocketTimeout ( ) { } public void setSocketTimeout ( int socketTimeout ) { } public boolean getSocketKeepAlive ( ) { } public void setSocketKeepAlive ( boolean socketKeepAlive ) { } public int getThreadsAllowedToBlockForConnectionMultiplier ( ) { } public void setThreadsAllowedToBlockForConnectionMultiplier ( int threadsAllowedToBlockForConnectionMultiplier ) { } public boolean getFsync ( ) { } public void setFsync ( boolean fsync ) { } public boolean getSafe ( ) { } public void setSafe ( boolean safe ) { } public boolean getWaitForJournaling ( ) { } public void setWaitForJournaling ( boolean waitForJournaling ) { } public int getWriteOperationNumberOfServers ( ) { } public void setWriteOperationNumberOfServers ( int writeOperationNumberOfServers ) { } public int getWriteOperationTimeout ( ) { } public void setWriteOperationTimeout ( int writeOperationTimeout ) { } public boolean getContinueOnInsertError ( ) { } public void setContinueOnInsertError ( boolean continueOnInsertError ) { } }

Fix:
throw new IllegalStateException ( ( ( ( "Variable:" + source ) + "<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>a<seq2seq4repair_space>MongoDB<seq2seq4repair_space>instance,<seq2seq4repair_space>class:" ) + ( mongoSource . getClass ( ) ) ) ) ;